summaryrefslogtreecommitdiff
path: root/src/nspawn/nspawn.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/nspawn/nspawn.c')
-rw-r--r--src/nspawn/nspawn.c1444
1 files changed, 0 insertions, 1444 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
deleted file mode 100644
index 244ebb8342..0000000000
--- a/src/nspawn/nspawn.c
+++ /dev/null
@@ -1,1444 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <signal.h>
-#include <sched.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/syscall.h>
-#include <sys/mount.h>
-#include <sys/wait.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>
-#include <sys/prctl.h>
-#include <sys/capability.h>
-#include <getopt.h>
-#include <sys/epoll.h>
-#include <termios.h>
-#include <sys/signalfd.h>
-#include <grp.h>
-#include <linux/fs.h>
-#include <sys/un.h>
-#include <sys/socket.h>
-
-#include <systemd/sd-daemon.h>
-
-#include "log.h"
-#include "util.h"
-#include "mkdir.h"
-#include "macro.h"
-#include "audit.h"
-#include "missing.h"
-#include "cgroup-util.h"
-#include "strv.h"
-#include "path-util.h"
-#include "loopback-setup.h"
-#include "sd-id128.h"
-#include "dev-setup.h"
-
-typedef enum LinkJournal {
- LINK_NO,
- LINK_AUTO,
- LINK_HOST,
- LINK_GUEST
-} LinkJournal;
-
-static char *arg_directory = NULL;
-static char *arg_user = NULL;
-static char **arg_controllers = NULL;
-static char *arg_uuid = NULL;
-static bool arg_private_network = false;
-static bool arg_read_only = false;
-static bool arg_boot = false;
-static LinkJournal arg_link_journal = LINK_AUTO;
-static uint64_t arg_retain =
- (1ULL << CAP_CHOWN) |
- (1ULL << CAP_DAC_OVERRIDE) |
- (1ULL << CAP_DAC_READ_SEARCH) |
- (1ULL << CAP_FOWNER) |
- (1ULL << CAP_FSETID) |
- (1ULL << CAP_IPC_OWNER) |
- (1ULL << CAP_KILL) |
- (1ULL << CAP_LEASE) |
- (1ULL << CAP_LINUX_IMMUTABLE) |
- (1ULL << CAP_NET_BIND_SERVICE) |
- (1ULL << CAP_NET_BROADCAST) |
- (1ULL << CAP_NET_RAW) |
- (1ULL << CAP_SETGID) |
- (1ULL << CAP_SETFCAP) |
- (1ULL << CAP_SETPCAP) |
- (1ULL << CAP_SETUID) |
- (1ULL << CAP_SYS_ADMIN) |
- (1ULL << CAP_SYS_CHROOT) |
- (1ULL << CAP_SYS_NICE) |
- (1ULL << CAP_SYS_PTRACE) |
- (1ULL << CAP_SYS_TTY_CONFIG) |
- (1ULL << CAP_SYS_RESOURCE) |
- (1ULL << CAP_SYS_BOOT);
-
-static int help(void) {
-
- printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
- "Spawn a minimal namespace container for debugging, testing and building.\n\n"
- " -h --help Show this help\n"
- " -D --directory=NAME Root directory for the container\n"
- " -b --boot Boot up full system (i.e. invoke init)\n"
- " -u --user=USER Run the command under specified user or uid\n"
- " -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
- " --uuid=UUID Set a specific machine UUID for the container\n"
- " --private-network Disable network in container\n"
- " --read-only Mount the root directory read-only\n"
- " --capability=CAP In addition to the default, retain specified capability\n"
- " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
- " -j Equivalent to --link-journal=host\n",
- program_invocation_short_name);
-
- return 0;
-}
-
-static int parse_argv(int argc, char *argv[]) {
-
- enum {
- ARG_PRIVATE_NETWORK = 0x100,
- ARG_UUID,
- ARG_READ_ONLY,
- ARG_CAPABILITY,
- ARG_LINK_JOURNAL
- };
-
- static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "directory", required_argument, NULL, 'D' },
- { "user", required_argument, NULL, 'u' },
- { "controllers", required_argument, NULL, 'C' },
- { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
- { "boot", no_argument, NULL, 'b' },
- { "uuid", required_argument, NULL, ARG_UUID },
- { "read-only", no_argument, NULL, ARG_READ_ONLY },
- { "capability", required_argument, NULL, ARG_CAPABILITY },
- { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
- { NULL, 0, NULL, 0 }
- };
-
- int c;
-
- assert(argc >= 0);
- assert(argv);
-
- while ((c = getopt_long(argc, argv, "+hD:u:C:bj", options, NULL)) >= 0) {
-
- switch (c) {
-
- case 'h':
- help();
- return 0;
-
- case 'D':
- free(arg_directory);
- arg_directory = canonicalize_file_name(optarg);
- if (!arg_directory) {
- log_error("Failed to canonicalize root directory.");
- return -ENOMEM;
- }
-
- break;
-
- case 'u':
- free(arg_user);
- if (!(arg_user = strdup(optarg))) {
- log_error("Failed to duplicate user name.");
- return -ENOMEM;
- }
-
- break;
-
- case 'C':
- strv_free(arg_controllers);
- arg_controllers = strv_split(optarg, ",");
- if (!arg_controllers) {
- log_error("Failed to split controllers list.");
- return -ENOMEM;
- }
- strv_uniq(arg_controllers);
-
- break;
-
- case ARG_PRIVATE_NETWORK:
- arg_private_network = true;
- break;
-
- case 'b':
- arg_boot = true;
- break;
-
- case ARG_UUID:
- arg_uuid = optarg;
- break;
-
- case ARG_READ_ONLY:
- arg_read_only = true;
- break;
-
- case ARG_CAPABILITY: {
- char *state, *word;
- size_t length;
-
- FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
- cap_value_t cap;
- char *t;
-
- t = strndup(word, length);
- if (!t)
- return log_oom();
-
- if (cap_from_name(t, &cap) < 0) {
- log_error("Failed to parse capability %s.", t);
- free(t);
- return -EINVAL;
- }
-
- free(t);
- arg_retain |= 1ULL << (uint64_t) cap;
- }
-
- break;
- }
-
- case 'j':
- arg_link_journal = LINK_GUEST;
- break;
-
- case ARG_LINK_JOURNAL:
- if (streq(optarg, "auto"))
- arg_link_journal = LINK_AUTO;
- else if (streq(optarg, "no"))
- arg_link_journal = LINK_NO;
- else if (streq(optarg, "guest"))
- arg_link_journal = LINK_GUEST;
- else if (streq(optarg, "host"))
- arg_link_journal = LINK_HOST;
- else {
- log_error("Failed to parse link journal mode %s", optarg);
- return -EINVAL;
- }
-
- break;
-
- case '?':
- return -EINVAL;
-
- default:
- log_error("Unknown option code %c", c);
- return -EINVAL;
- }
- }
-
- return 1;
-}
-
-static int mount_all(const char *dest) {
-
- typedef struct MountPoint {
- const char *what;
- const char *where;
- const char *type;
- const char *options;
- unsigned long flags;
- bool fatal;
- } MountPoint;
-
- static const MountPoint mount_table[] = {
- { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
- { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */
- { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
- { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
- { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
- { "/dev/pts", "/dev/pts", NULL, NULL, MS_BIND, true },
- { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
- { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
-#ifdef HAVE_SELINUX
- { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */
- { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
-#endif
- };
-
- unsigned k;
- int r = 0;
-
- for (k = 0; k < ELEMENTSOF(mount_table); k++) {
- char _cleanup_free_ *where = NULL;
- int t;
-
- if (asprintf(&where, "%s/%s", dest, mount_table[k].where) < 0) {
- log_oom();
-
- if (r == 0)
- r = -ENOMEM;
-
- break;
- }
-
- t = path_is_mount_point(where, true);
- if (t < 0) {
- log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
-
- if (r == 0)
- r = t;
-
- continue;
- }
-
- /* Skip this entry if it is not a remount. */
- if (mount_table[k].what && t > 0)
- continue;
-
- mkdir_p_label(where, 0755);
-
- if (mount(mount_table[k].what,
- where,
- mount_table[k].type,
- mount_table[k].flags,
- mount_table[k].options) < 0 &&
- mount_table[k].fatal) {
-
- log_error("mount(%s) failed: %m", where);
-
- if (r == 0)
- r = -errno;
- }
- }
-
- return r;
-}
-
-static int setup_timezone(const char *dest) {
- _cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
- char *z, *y;
- int r;
-
- assert(dest);
-
- /* Fix the timezone, if possible */
- r = readlink_malloc("/etc/localtime", &p);
- if (r < 0) {
- log_warning("/etc/localtime is not a symlink, not updating container timezone.");
- return 0;
- }
-
- z = path_startswith(p, "../usr/share/zoneinfo/");
- if (!z)
- z = path_startswith(p, "/usr/share/zoneinfo/");
- if (!z) {
- log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
- return 0;
- }
-
- where = strappend(dest, "/etc/localtime");
- if (!where)
- return log_oom();
-
- r = readlink_malloc(where, &q);
- if (r >= 0) {
- y = path_startswith(q, "../usr/share/zoneinfo/");
- if (!y)
- y = path_startswith(q, "/usr/share/zoneinfo/");
-
-
- /* Already pointing to the right place? Then do nothing .. */
- if (y && streq(y, z))
- return 0;
- }
-
- check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
- if (!check)
- return log_oom();
-
- if (access(check, F_OK) < 0) {
- log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
- return 0;
- }
-
- what = strappend("../usr/share/zoneinfo/", z);
- if (!what)
- return log_oom();
-
- unlink(where);
- if (symlink(what, where) < 0) {
- log_error("Failed to correct timezone of container: %m");
- return 0;
- }
-
- return 0;
-}
-
-static int setup_resolv_conf(const char *dest) {
- char *where;
-
- assert(dest);
-
- if (arg_private_network)
- return 0;
-
- /* Fix resolv.conf, if possible */
- where = strappend(dest, "/etc/resolv.conf");
- if (!where)
- return log_oom();
-
- /* We don't really care for the results of this really. If it
- * fails, it fails, but meh... */
- if (mount("/etc/resolv.conf", where, "bind", MS_BIND, NULL) >= 0)
- mount("/etc/resolv.conf", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
-
- free(where);
-
- return 0;
-}
-
-static int setup_boot_id(const char *dest) {
- char _cleanup_free_ *from = NULL, *to = NULL;
- sd_id128_t rnd;
- char as_uuid[37];
- int r;
-
- assert(dest);
-
- /* Generate a new randomized boot ID, so that each boot-up of
- * the container gets a new one */
-
- from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");
- to = strappend(dest, "/proc/sys/kernel/random/boot_id");
- if (!from || !to)
- return log_oom();
-
- r = sd_id128_randomize(&rnd);
- if (r < 0) {
- log_error("Failed to generate random boot id: %s", strerror(-r));
- return r;
- }
-
- snprintf(as_uuid, sizeof(as_uuid),
- "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
- SD_ID128_FORMAT_VAL(rnd));
- char_array_0(as_uuid);
-
- r = write_one_line_file(from, as_uuid);
- if (r < 0) {
- log_error("Failed to write boot id: %s", strerror(-r));
- return r;
- }
-
- if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
- log_error("Failed to bind mount boot id: %m");
- r = -errno;
- } else
- mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
-
- unlink(from);
- return r;
-}
-
-static int copy_devnodes(const char *dest) {
-
- static const char devnodes[] =
- "null\0"
- "zero\0"
- "full\0"
- "random\0"
- "urandom\0"
- "tty\0"
- "ptmx\0";
-
- const char *d;
- int r = 0;
- mode_t _cleanup_umask_ u;
-
- assert(dest);
-
- u = umask(0000);
-
- NULSTR_FOREACH(d, devnodes) {
- struct stat st;
- char _cleanup_free_ *from = NULL, *to = NULL;
-
- asprintf(&from, "/dev/%s", d);
- asprintf(&to, "%s/dev/%s", dest, d);
-
- if (!from || !to) {
- log_oom();
-
- if (r == 0)
- r = -ENOMEM;
-
- break;
- }
-
- if (stat(from, &st) < 0) {
-
- if (errno != ENOENT) {
- log_error("Failed to stat %s: %m", from);
- if (r == 0)
- r = -errno;
- }
-
- } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
-
- log_error("%s is not a char or block device, cannot copy", from);
- if (r == 0)
- r = -EIO;
-
- } else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
-
- log_error("mknod(%s) failed: %m", dest);
- if (r == 0)
- r = -errno;
- }
- }
-
- return r;
-}
-
-static int setup_dev_console(const char *dest, const char *console) {
- struct stat st;
- char _cleanup_free_ *to = NULL;
- int r;
- mode_t _cleanup_umask_ u;
-
- assert(dest);
- assert(console);
-
- u = umask(0000);
-
- if (stat(console, &st) < 0) {
- log_error("Failed to stat %s: %m", console);
- return -errno;
-
- } else if (!S_ISCHR(st.st_mode)) {
- log_error("/dev/console is not a char device");
- return -EIO;
- }
-
- r = chmod_and_chown(console, 0600, 0, 0);
- if (r < 0) {
- log_error("Failed to correct access mode for TTY: %s", strerror(-r));
- return r;
- }
-
- if (asprintf(&to, "%s/dev/console", dest) < 0)
- return log_oom();
-
- /* We need to bind mount the right tty to /dev/console since
- * ptys can only exist on pts file systems. To have something
- * to bind mount things on we create a device node first, that
- * has the right major/minor (note that the major minor
- * doesn't actually matter here, since we mount it over
- * anyway). */
-
- if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
- log_error("mknod() for /dev/console failed: %m");
- return -errno;
- }
-
- if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
- log_error("Bind mount for /dev/console failed: %m");
- return -errno;
- }
-
- return 0;
-}
-
-static int setup_kmsg(const char *dest, int kmsg_socket) {
- char _cleanup_free_ *from = NULL, *to = NULL;
- int r, fd, k;
- mode_t _cleanup_umask_ u;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(int))];
- } control;
- struct msghdr mh;
- struct cmsghdr *cmsg;
-
- assert(dest);
- assert(kmsg_socket >= 0);
-
- u = umask(0000);
-
- /* We create the kmsg FIFO as /dev/kmsg, but immediately
- * delete it after bind mounting it to /proc/kmsg. While FIFOs
- * on the reading side behave very similar to /proc/kmsg,
- * their writing side behaves differently from /dev/kmsg in
- * that writing blocks when nothing is reading. In order to
- * avoid any problems with containers deadlocking due to this
- * we simply make /dev/kmsg unavailable to the container. */
- if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
- asprintf(&to, "%s/proc/kmsg", dest) < 0)
- return log_oom();
-
- if (mkfifo(from, 0600) < 0) {
- log_error("mkfifo() for /dev/kmsg failed: %m");
- return -errno;
- }
-
- r = chmod_and_chown(from, 0600, 0, 0);
- if (r < 0) {
- log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));
- return r;
- }
-
- if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
- log_error("Bind mount for /proc/kmsg failed: %m");
- return -errno;
- }
-
- fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
- if (fd < 0) {
- log_error("Failed to open fifo: %m");
- return -errno;
- }
-
- zero(mh);
- zero(control);
-
- mh.msg_control = &control;
- mh.msg_controllen = sizeof(control);
-
- cmsg = CMSG_FIRSTHDR(&mh);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
-
- mh.msg_controllen = cmsg->cmsg_len;
-
- /* Store away the fd in the socket, so that it stays open as
- * long as we run the child */
- k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
- close_nointr_nofail(fd);
-
- if (k < 0) {
- log_error("Failed to send FIFO fd: %m");
- return -errno;
- }
-
- /* And now make the FIFO unavailable as /dev/kmsg... */
- unlink(from);
- return 0;
-}
-
-static int setup_hostname(void) {
- char *hn;
- int r = 0;
-
- hn = path_get_file_name(arg_directory);
- if (hn) {
- hn = strdup(hn);
- if (!hn)
- return -ENOMEM;
-
- hostname_cleanup(hn);
-
- if (!isempty(hn))
- if (sethostname(hn, strlen(hn)) < 0)
- r = -errno;
-
- free(hn);
- }
-
- return r;
-}
-
-static int setup_journal(const char *directory) {
- sd_id128_t machine_id;
- char _cleanup_free_ *p = NULL, *b = NULL, *q = NULL, *d = NULL;
- char *id;
- int r;
-
- if (arg_link_journal == LINK_NO)
- return 0;
-
- p = strappend(directory, "/etc/machine-id");
- if (!p)
- return log_oom();
-
- r = read_one_line_file(p, &b);
- if (r == -ENOENT && arg_link_journal == LINK_AUTO)
- return 0;
- else if (r < 0) {
- log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
- return r;
- }
-
- id = strstrip(b);
- if (isempty(id) && arg_link_journal == LINK_AUTO)
- return 0;
-
- /* Verify validity */
- r = sd_id128_from_string(id, &machine_id);
- if (r < 0) {
- log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
- return r;
- }
-
- free(p);
- p = strappend("/var/log/journal/", id);
- q = strjoin(directory, "/var/log/journal/", id, NULL);
- if (!p || !q)
- return log_oom();
-
- if (path_is_mount_point(p, false) > 0) {
- if (arg_link_journal != LINK_AUTO) {
- log_error("%s: already a mount point, refusing to use for journal", p);
- return -EEXIST;
- }
-
- return 0;
- }
-
- if (path_is_mount_point(q, false) > 0) {
- if (arg_link_journal != LINK_AUTO) {
- log_error("%s: already a mount point, refusing to use for journal", q);
- return -EEXIST;
- }
-
- return 0;
- }
-
- r = readlink_and_make_absolute(p, &d);
- if (r >= 0) {
- if ((arg_link_journal == LINK_GUEST ||
- arg_link_journal == LINK_AUTO) &&
- path_equal(d, q)) {
-
- r = mkdir_p(q, 0755);
- if (r < 0)
- log_warning("failed to create directory %s: %m", q);
- return 0;
- }
-
- if (unlink(p) < 0) {
- log_error("Failed to remove symlink %s: %m", p);
- return -errno;
- }
- } else if (r == -EINVAL) {
-
- if (arg_link_journal == LINK_GUEST &&
- rmdir(p) < 0) {
-
- if (errno == ENOTDIR) {
- log_error("%s already exists and is neither a symlink nor a directory", p);
- return r;
- } else {
- log_error("Failed to remove %s: %m", p);
- return -errno;
- }
- }
- } else if (r != -ENOENT) {
- log_error("readlink(%s) failed: %m", p);
- return r;
- }
-
- if (arg_link_journal == LINK_GUEST) {
-
- if (symlink(q, p) < 0) {
- log_error("Failed to symlink %s to %s: %m", q, p);
- return -errno;
- }
-
- r = mkdir_p(q, 0755);
- if (r < 0)
- log_warning("failed to create directory %s: %m", q);
- return 0;
- }
-
- if (arg_link_journal == LINK_HOST) {
- r = mkdir_p(p, 0755);
- if (r < 0) {
- log_error("Failed to create %s: %m", p);
- return r;
- }
-
- } else if (access(p, F_OK) < 0)
- return 0;
-
- if (dir_is_empty(q) == 0) {
- log_error("%s not empty.", q);
- return -ENOTEMPTY;
- }
-
- r = mkdir_p(q, 0755);
- if (r < 0) {
- log_error("Failed to create %s: %m", q);
- return r;
- }
-
- if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
- log_error("Failed to bind mount journal from host into guest: %m");
- return -errno;
- }
-
- return 0;
-}
-
-static int drop_capabilities(void) {
- return capability_bounding_set_drop(~arg_retain, false);
-}
-
-static int is_os_tree(const char *path) {
- int r;
- char *p;
- /* We use /bin/sh as flag file if something is an OS */
-
- if (asprintf(&p, "%s/bin/sh", path) < 0)
- return -ENOMEM;
-
- r = access(p, F_OK);
- free(p);
-
- return r < 0 ? 0 : 1;
-}
-
-static int process_pty(int master, sigset_t *mask) {
-
- char in_buffer[LINE_MAX], out_buffer[LINE_MAX];
- size_t in_buffer_full = 0, out_buffer_full = 0;
- struct epoll_event stdin_ev, stdout_ev, master_ev, signal_ev;
- bool stdin_readable = false, stdout_writable = false, master_readable = false, master_writable = false;
- int ep = -1, signal_fd = -1, r;
-
- fd_nonblock(STDIN_FILENO, 1);
- fd_nonblock(STDOUT_FILENO, 1);
- fd_nonblock(master, 1);
-
- signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC);
- if (signal_fd < 0) {
- log_error("signalfd(): %m");
- r = -errno;
- goto finish;
- }
-
- ep = epoll_create1(EPOLL_CLOEXEC);
- if (ep < 0) {
- log_error("Failed to create epoll: %m");
- r = -errno;
- goto finish;
- }
-
- zero(stdin_ev);
- stdin_ev.events = EPOLLIN|EPOLLET;
- stdin_ev.data.fd = STDIN_FILENO;
-
- zero(stdout_ev);
- stdout_ev.events = EPOLLOUT|EPOLLET;
- stdout_ev.data.fd = STDOUT_FILENO;
-
- zero(master_ev);
- master_ev.events = EPOLLIN|EPOLLOUT|EPOLLET;
- master_ev.data.fd = master;
-
- zero(signal_ev);
- signal_ev.events = EPOLLIN;
- signal_ev.data.fd = signal_fd;
-
- if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, signal_fd, &signal_ev) < 0) {
- log_error("Failed to regiser fds in epoll: %m");
- r = -errno;
- goto finish;
- }
-
- for (;;) {
- struct epoll_event ev[16];
- ssize_t k;
- int i, nfds;
-
- nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1);
- if (nfds < 0) {
-
- if (errno == EINTR || errno == EAGAIN)
- continue;
-
- log_error("epoll_wait(): %m");
- r = -errno;
- goto finish;
- }
-
- assert(nfds >= 1);
-
- for (i = 0; i < nfds; i++) {
- if (ev[i].data.fd == STDIN_FILENO) {
-
- if (ev[i].events & (EPOLLIN|EPOLLHUP))
- stdin_readable = true;
-
- } else if (ev[i].data.fd == STDOUT_FILENO) {
-
- if (ev[i].events & (EPOLLOUT|EPOLLHUP))
- stdout_writable = true;
-
- } else if (ev[i].data.fd == master) {
-
- if (ev[i].events & (EPOLLIN|EPOLLHUP))
- master_readable = true;
-
- if (ev[i].events & (EPOLLOUT|EPOLLHUP))
- master_writable = true;
-
- } else if (ev[i].data.fd == signal_fd) {
- struct signalfd_siginfo sfsi;
- ssize_t n;
-
- n = read(signal_fd, &sfsi, sizeof(sfsi));
- if (n != sizeof(sfsi)) {
-
- if (n >= 0) {
- log_error("Failed to read from signalfd: invalid block size");
- r = -EIO;
- goto finish;
- }
-
- if (errno != EINTR && errno != EAGAIN) {
- log_error("Failed to read from signalfd: %m");
- r = -errno;
- goto finish;
- }
- } else {
-
- if (sfsi.ssi_signo == SIGWINCH) {
- struct winsize ws;
-
- /* The window size changed, let's forward that. */
- if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
- ioctl(master, TIOCSWINSZ, &ws);
- } else {
- r = 0;
- goto finish;
- }
- }
- }
- }
-
- while ((stdin_readable && in_buffer_full <= 0) ||
- (master_writable && in_buffer_full > 0) ||
- (master_readable && out_buffer_full <= 0) ||
- (stdout_writable && out_buffer_full > 0)) {
-
- if (stdin_readable && in_buffer_full < LINE_MAX) {
-
- k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full);
- if (k < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- stdin_readable = false;
- else {
- log_error("read(): %m");
- r = -errno;
- goto finish;
- }
- } else
- in_buffer_full += (size_t) k;
- }
-
- if (master_writable && in_buffer_full > 0) {
-
- k = write(master, in_buffer, in_buffer_full);
- if (k < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- master_writable = false;
- else {
- log_error("write(): %m");
- r = -errno;
- goto finish;
- }
-
- } else {
- assert(in_buffer_full >= (size_t) k);
- memmove(in_buffer, in_buffer + k, in_buffer_full - k);
- in_buffer_full -= k;
- }
- }
-
- if (master_readable && out_buffer_full < LINE_MAX) {
-
- k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full);
- if (k < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- master_readable = false;
- else {
- log_error("read(): %m");
- r = -errno;
- goto finish;
- }
- } else
- out_buffer_full += (size_t) k;
- }
-
- if (stdout_writable && out_buffer_full > 0) {
-
- k = write(STDOUT_FILENO, out_buffer, out_buffer_full);
- if (k < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- stdout_writable = false;
- else {
- log_error("write(): %m");
- r = -errno;
- goto finish;
- }
-
- } else {
- assert(out_buffer_full >= (size_t) k);
- memmove(out_buffer, out_buffer + k, out_buffer_full - k);
- out_buffer_full -= k;
- }
- }
- }
- }
-
-finish:
- if (ep >= 0)
- close_nointr_nofail(ep);
-
- if (signal_fd >= 0)
- close_nointr_nofail(signal_fd);
-
- return r;
-}
-
-int main(int argc, char *argv[]) {
- pid_t pid = 0;
- int r = EXIT_FAILURE, k;
- char *oldcg = NULL, *newcg = NULL;
- char **controller = NULL;
- int master = -1;
- const char *console = NULL;
- struct termios saved_attr, raw_attr;
- sigset_t mask;
- bool saved_attr_valid = false;
- struct winsize ws;
- int kmsg_socket_pair[2] = { -1, -1 };
-
- log_parse_environment();
- log_open();
-
- r = parse_argv(argc, argv);
- if (r <= 0)
- goto finish;
-
- if (arg_directory) {
- char *p;
-
- p = path_make_absolute_cwd(arg_directory);
- free(arg_directory);
- arg_directory = p;
- } else
- arg_directory = get_current_dir_name();
-
- if (!arg_directory) {
- log_error("Failed to determine path");
- goto finish;
- }
-
- path_kill_slashes(arg_directory);
-
- if (geteuid() != 0) {
- log_error("Need to be root.");
- goto finish;
- }
-
- if (sd_booted() <= 0) {
- log_error("Not running on a systemd system.");
- goto finish;
- }
-
- if (path_equal(arg_directory, "/")) {
- log_error("Spawning container on root directory not supported.");
- goto finish;
- }
-
- if (is_os_tree(arg_directory) <= 0) {
- log_error("Directory %s doesn't look like an OS root directory. Refusing.", arg_directory);
- goto finish;
- }
-
- k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg);
- if (k < 0) {
- log_error("Failed to determine current cgroup: %s", strerror(-k));
- goto finish;
- }
-
- if (asprintf(&newcg, "%s/nspawn-%lu", oldcg, (unsigned long) getpid()) < 0) {
- log_error("Failed to allocate cgroup path.");
- goto finish;
- }
-
- k = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, newcg, 0);
- if (k < 0) {
- log_error("Failed to create cgroup: %s", strerror(-k));
- goto finish;
- }
-
- STRV_FOREACH(controller, arg_controllers) {
- k = cg_create_and_attach(*controller, newcg, 0);
- if (k < 0)
- log_warning("Failed to create cgroup in controller %s: %s", *controller, strerror(-k));
- }
-
- master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
- if (master < 0) {
- log_error("Failed to acquire pseudo tty: %m");
- goto finish;
- }
-
- console = ptsname(master);
- if (!console) {
- log_error("Failed to determine tty name: %m");
- goto finish;
- }
-
- log_info("Spawning namespace container on %s (console is %s).", arg_directory, console);
-
- if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
- ioctl(master, TIOCSWINSZ, &ws);
-
- if (unlockpt(master) < 0) {
- log_error("Failed to unlock tty: %m");
- goto finish;
- }
-
- if (tcgetattr(STDIN_FILENO, &saved_attr) < 0) {
- log_error("Failed to get terminal attributes: %m");
- goto finish;
- }
-
- saved_attr_valid = true;
-
- raw_attr = saved_attr;
- cfmakeraw(&raw_attr);
- raw_attr.c_lflag &= ~ECHO;
-
- if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
- log_error("Failed to create kmsg socket pair");
- goto finish;
- }
-
- assert_se(sigemptyset(&mask) == 0);
- sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
- assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
-
- for (;;) {
- siginfo_t status;
-
- if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_attr) < 0) {
- log_error("Failed to set terminal attributes: %m");
- goto finish;
- }
-
- pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS|(arg_private_network ? CLONE_NEWNET : 0), NULL);
- if (pid < 0) {
- if (errno == EINVAL)
- log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
- else
- log_error("clone() failed: %m");
-
- goto finish;
- }
-
- if (pid == 0) {
- /* child */
-
- const char *home = NULL;
- uid_t uid = (uid_t) -1;
- gid_t gid = (gid_t) -1;
- const char *envp[] = {
- "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
- "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
- NULL, /* TERM */
- NULL, /* HOME */
- NULL, /* USER */
- NULL, /* LOGNAME */
- NULL, /* container_uuid */
- NULL
- };
-
- envp[2] = strv_find_prefix(environ, "TERM=");
-
- close_nointr_nofail(master);
-
- close_nointr(STDIN_FILENO);
- close_nointr(STDOUT_FILENO);
- close_nointr(STDERR_FILENO);
-
- close_all_fds(&kmsg_socket_pair[1], 1);
-
- reset_all_signal_handlers();
-
- assert_se(sigemptyset(&mask) == 0);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
-
- if (open_terminal(console, O_RDWR) != STDIN_FILENO ||
- dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
- dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
- goto child_fail;
-
- if (setsid() < 0) {
- log_error("setsid() failed: %m");
- goto child_fail;
- }
-
- if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
- log_error("PR_SET_PDEATHSIG failed: %m");
- goto child_fail;
- }
-
- /* Mark everything as slave, so that we still
- * receive mounts from the real root, but don't
- * propagate mounts to the real root. */
- if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
- log_error("MS_SLAVE|MS_REC failed: %m");
- goto child_fail;
- }
-
- /* Turn directory into bind mount */
- if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
- log_error("Failed to make bind mount.");
- goto child_fail;
- }
-
- if (arg_read_only)
- if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY|MS_REC, NULL) < 0) {
- log_error("Failed to make read-only.");
- goto child_fail;
- }
-
- if (mount_all(arg_directory) < 0)
- goto child_fail;
-
- if (copy_devnodes(arg_directory) < 0)
- goto child_fail;
-
- dev_setup(arg_directory);
-
- if (setup_dev_console(arg_directory, console) < 0)
- goto child_fail;
-
- if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
- goto child_fail;
-
- close_nointr_nofail(kmsg_socket_pair[1]);
-
- if (setup_boot_id(arg_directory) < 0)
- goto child_fail;
-
- if (setup_timezone(arg_directory) < 0)
- goto child_fail;
-
- if (setup_resolv_conf(arg_directory) < 0)
- goto child_fail;
-
- if (setup_journal(arg_directory) < 0)
- goto child_fail;
-
- if (chdir(arg_directory) < 0) {
- log_error("chdir(%s) failed: %m", arg_directory);
- goto child_fail;
- }
-
- if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
- log_error("mount(MS_MOVE) failed: %m");
- goto child_fail;
- }
-
- if (chroot(".") < 0) {
- log_error("chroot() failed: %m");
- goto child_fail;
- }
-
- if (chdir("/") < 0) {
- log_error("chdir() failed: %m");
- goto child_fail;
- }
-
- umask(0022);
-
- loopback_setup();
-
- if (drop_capabilities() < 0) {
- log_error("drop_capabilities() failed: %m");
- goto child_fail;
- }
-
- if (arg_user) {
-
- /* Note that this resolves user names
- * inside the container, and hence
- * accesses the NSS modules from the
- * container and not the host. This is
- * a bit weird... */
-
- if (get_user_creds((const char**)&arg_user, &uid, &gid, &home, NULL) < 0) {
- log_error("get_user_creds() failed: %m");
- goto child_fail;
- }
-
- if (mkdir_parents_label(home, 0775) < 0) {
- log_error("mkdir_parents_label() failed: %m");
- goto child_fail;
- }
-
- if (mkdir_safe_label(home, 0775, uid, gid) < 0) {
- log_error("mkdir_safe_label() failed: %m");
- goto child_fail;
- }
-
- if (initgroups((const char*)arg_user, gid) < 0) {
- log_error("initgroups() failed: %m");
- goto child_fail;
- }
-
- if (setresgid(gid, gid, gid) < 0) {
- log_error("setregid() failed: %m");
- goto child_fail;
- }
-
- if (setresuid(uid, uid, uid) < 0) {
- log_error("setreuid() failed: %m");
- goto child_fail;
- }
- }
-
- if ((asprintf((char**)(envp + 3), "HOME=%s", home ? home: "/root") < 0) ||
- (asprintf((char**)(envp + 4), "USER=%s", arg_user ? arg_user : "root") < 0) ||
- (asprintf((char**)(envp + 5), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
- log_oom();
- goto child_fail;
- }
-
- if (arg_uuid) {
- if (asprintf((char**)(envp + 6), "container_uuid=%s", arg_uuid) < 0) {
- log_oom();
- goto child_fail;
- }
- }
-
- setup_hostname();
-
- if (arg_boot) {
- char **a;
- size_t l;
-
- /* Automatically search for the init system */
-
- l = 1 + argc - optind;
- a = newa(char*, l + 1);
- memcpy(a + 1, argv + optind, l * sizeof(char*));
-
- a[0] = (char*) "/usr/lib/systemd/systemd";
- execve(a[0], a, (char**) envp);
-
- a[0] = (char*) "/lib/systemd/systemd";
- execve(a[0], a, (char**) envp);
-
- a[0] = (char*) "/sbin/init";
- execve(a[0], a, (char**) envp);
- } else if (argc > optind)
- execvpe(argv[optind], argv + optind, (char**) envp);
- else {
- chdir(home ? home : "/root");
- execle("/bin/bash", "-bash", NULL, (char**) envp);
- }
-
- log_error("execv() failed: %m");
-
- child_fail:
- _exit(EXIT_FAILURE);
- }
-
- if (process_pty(master, &mask) < 0)
- goto finish;
-
-
- if (saved_attr_valid)
- tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
-
- r = wait_for_terminate(pid, &status);
- if (r < 0) {
- r = EXIT_FAILURE;
- break;
- }
-
- if (status.si_code == CLD_EXITED) {
- if (status.si_status != 0) {
- log_error("Container failed with error code %i.", status.si_status);
- r = status.si_status;
- break;
- }
-
- log_debug("Container exited successfully.");
- break;
- } else if (status.si_code == CLD_KILLED &&
- status.si_status == SIGINT) {
- log_info("Container has been shut down.");
- r = 0;
- break;
- } else if (status.si_code == CLD_KILLED &&
- status.si_status == SIGHUP) {
- log_info("Container is being rebooted.");
- continue;
- } else if (status.si_code == CLD_KILLED ||
- status.si_code == CLD_DUMPED) {
-
- log_error("Container terminated by signal %s.", signal_to_string(status.si_status));
- r = EXIT_FAILURE;
- break;
- } else {
- log_error("Container failed due to unknown reason.");
- r = EXIT_FAILURE;
- break;
- }
- }
-
-finish:
- if (saved_attr_valid)
- tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
-
- if (master >= 0)
- close_nointr_nofail(master);
-
- close_pipe(kmsg_socket_pair);
-
- if (oldcg)
- cg_attach(SYSTEMD_CGROUP_CONTROLLER, oldcg, 0);
-
- if (newcg)
- cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, newcg, true);
-
- free(arg_directory);
- strv_free(arg_controllers);
- free(oldcg);
- free(newcg);
-
- return r;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 00:35:14 +0000